CERCLA-Wheeling Disposal Superfund Site
Location: Amazonia, Mo.
Client: Wheeling Disposal Superfund Site — Wenck Associates
Completion Date: Remedial Actions Completed: 1994; Site Delisted: 2000; Monitoring: Ongoing
Burns & McDonnell was retained by the Wheeling Disposal Site Trust to conduct a RI/FS of the Wheeling Disposal Site in northeast Missouri. Burns & McDonnell also provided ROD assistance and a design and installation of the remedial action (landfill cap). The 200-acre National Priorities List (NPL) site contains an industrial waste landfill that received a variety of liquid and solid wastes that contained pesticides, heavy metals, solvents and volatile organics.
Burns & McDonnell provided technical consultation and coordinated direct negotiations with the Environmental Protection Agency (EPA) on behalf of the Wheeling Disposal Site Trust throughout the project. In addition, Burns & McDonnell served as the trust’s community relations contact, which included direct discussions and interviews with the newspapers and attending and participating in public hearings.
- Remedial investigation (RI) with baseline risk assessment (BLRA)
- Feasibility study (FS)
- Record of decision (ROD)
- Remediation design and installation
- Ramp down of site monitoring
Burns & McDonnell conducted an initial site assessment which included a review and evaluation of past historical data including landfill records and design documents, subsurface investigation reports, boring logs, groundwater data, assessment reports, and state and county data on surrounding groundwater and surface water. Conclusions were drawn pertaining to hazardous substances present, potential migratory pathways and receptors in the area. The results of this effort laid the foundation for the scope of work necessary in the RI.
Burns & McDonnell prepared the necessary work plans, sampling and analysis plan, quality assurance project plan, and health and safety plan for the remedial investigation field work. The work plans were approved by EPA Region VII. Investigative field work included a geophysical survey, surface and subsurface soils investigations, nested monitoring well installations, surface water and groundwater sampling and analysis, and stream sampling and analysis. A determination was made of the horizontal and vertical extent of contaminants in the soil and groundwater. Computer modeling was used for the various media to determine potential fate and transport of contaminants detected at the site.
A BLRA identified the chemicals of concern, exposure routes and the risk to human health and environment. Reports summarizing the results and conclusions of the RI and the BLRA were approved by EPA Region VII.
The completed FS evaluated several remedial alternatives with institutional controls, capping of the site, security improvements and on-going monitoring of the site the recommended actions at an estimated cost of $2 million. EPA concurred with the recommendations.
Remedial Design and Installation
Burns & McDonnell completed the design for the proposed remediation. The design included a Resource Conservation and Recovery Act (RCRA) cap and nested monitoring wells. The Hydraulic Evaluation of Landfill Performance (HELP) model was used to determine the most cost-effective RCRA cap design.
Burns & McDonnell installed a series of four RCRA caps covering approximately seven acres. In addition, a monitoring program was established to evaluate the effectiveness of the remedial action. Quarterly monitoring was conducted for groundwater and surface water beginning in 1994. Included in this monitoring program were regular site evaluations to review site conditions and to determine if maintenance activities were needed.
Ramp Down and Site Delisting
In 1998, Burns & McDonnell was successful in implementing a ramp down program, approved by the EPA, in which the frequency of the monitoring program was reduced from quarterly to semi-annual and selected monitoring wells were removed from the network. This resulted in a significant reduction costs for sampling, laboratory analysis and reporting. Site inspections were also reduced from quarterly to semi-annual.
Two years later, Burns & McDonnell performed a five-year review of the site, and once again was successful in reducing the monitoring program, this time from semi-annual to annual monitoring. After implementation of the annual monitoring program, the EPA delisted the site in October 2000. Burns & McDonnell continues to conduct the site monitoring.